That will be okay for a yearling or two-year-old. However they will eventually grow to more than 2 metres in length and will need more room to stretch out.
My Bredli girl is only 18months old and she is in a 1300x1300x700 tank. Will last her for the rest of her days. I think anything under 4x2x2 is too small.
Snowsnake- my bredli only uses the ground for her hides and is always up in the perches.